Interlacing problem - display issue or something else?

Hi, another interlacing question...
So I captured my footage (originally shot on film, telecined to digibeta) at 10 bit uncompressed to do my online (the offline edit was a 29.97 DVCam dub of that digibeta). Since I'm finishing on 29.97 digibeta, I didn't remove the pulldown as I captured offline or online, and am editing both at my finishing medium's frame rate. So yes, I have the duped fields in there, but it also keeps things simple and I've theoretically been seeing exactly what the finished version will look like the whole time.
Last time I did this workflow I used a G4 running a dual 867 processor with a gig of RAM, and I had some jitter and interlacing "comb" visible when I watched the 10-bit on the Mac, but when I output to digibeta and DVD, it looked fine. So it appeared to be that my computer simply didn't have the juice to display it properly, but that the media itself was fine, as were both ways of outputting.
Now I have a spankin' new Mac Pro with a quad 2.66G processor and 3Gigs of RAM, so I figured that "display issue" was behind me. But not only do I still see jitter and comb on my computer monitor, I also see it much worse on the test DVD I just made. So the problem isn't just the display. The look is very similar to when you capture a clip and remove the pulldown, but fail to start capture on an A frame (but since this is all 29.97, I know that isn't the problem).
I thought it might be that the drives were not fast enough, so I reformatted two of my internal drives into a Raid 0 and put the media there and reconnected it. The raid seems happy, and it's less than half full, but the video doesn't look any better.
Any idea what else could be causing this? I did just upgrade the project from the FCP 4.5 version I started to the FCP 6 on the new machine, plus my experience has been that moving from offline DV to online can allow in some bugs, but the ins/outs, clip names, frame rates, haven't changed. And of course I've been editnig 29.97 DV this whole time without seeing any of the interlacing on the monitor or tyhe outputs. Could field dominance have anything to do with this? I've never adjusted that in previous applications of this workflow, so it doesn't seem relevant, but I confess I'm not sure what I'm messing with there. Do I need still more RAM? The computers we ran at school a couple of years ago were running 10 bit video on G5s without significant upgrades to my knowledge, and this is just a single stream with a few tracks of audio here. I'm afraid to spend any more $$ until I'm pretty confident it'll solve the problem (shoestring budget here of course). Any thoughts?
Many thanks.
-Jeremy

Thanks for the reply. I don't really have a way to hook up my computer to a broadcast monitor. I know I should, but can't really afford the card to do it. So I color corrected my footage carefully during telecine, and for things like this issue, I'm making DVDs quick and dirty through iDVD, then watching them on my home TV (an LCD that plays both SD and HD).
I suppose something in my DVD player and/or TV might be giving me the weirdness in the display, but I think I mentioned I did this same workflow before on a lowly G4, and back then while the computer display showed the interlacing problems, the final output looks fine on the same TV/DVD setup I'm using now. (And I also output that timeline on the previous project to a digibeta master and it looked great too--unfortunately no way to test that digibeta output on the present project without going to a post house, which of course cuts into the budget.)
Maybe I need to bite the bullet and stop being so cheap, but I'm hung up on the fact that it worked fine before, and I can't see how this stronger computer is performing comparatively poorly.
BTW I do see the interlacing in FCP viewer and canvas, but only when it's set to 100% size. And it looks identical in Quicktime as well.
The other thought that just occurred to me is that it might be a codec issue. Perhaps the uncompressed 10 bit codec on my new machine isn't quite the same 10 bit uncompressed as the Kona card used to capture the video for both new and old projects. Maybe my old computer worked ok because that codec was slightly different, or I may have even copied the codec to that computer at some point in the past.
Any of this spur any other ideas? Again I really appreciate the help...
-Jeremy

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